Page:Popular Science Monthly Volume 73.djvu/62

Transformation Products of Thorium, Actinium and Radium according to Rutherford

while the emanation underwent a change into argon. The lithium, we are assured, could not be found in the original materials; it represents about .01 per cent, of the sodium and calcium found in the same experiment; its actual amount, after correcting a slight oversight in Ramsay's estimate, would be 0.00000003 gram. For such a quantity the amount of copper transformed would be too minute for the detection of a loss from the 0.3 gram of copper which the original solution may be assumed